<template>
  <!-- 项目主体，进入位置，后面需要优化一下CSS样式 -->
  <div id="app">
    <router-view />
  </div>
</template>

<script>
import { ElMessage, ElMessageBox } from "element-plus";
export default {
  name: "App",
  created() {
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store")) {
      this.$store.replaceState(
        Object.assign(
          {},
          this.$store.state,
          JSON.parse(sessionStorage.getItem("store"))
        )
      );
    }

    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload", () => {
      sessionStorage.setItem("store", JSON.stringify(this.$store.state));
    });
  },
};
</script>
<style >
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}
html,
body,
#app {
  height: 100%;
  width: 100%;
  top: 0px;
  left: 0px;
  margin: 0;
 
}
div {
  display: block;
}
</style>
